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<title>如何用HTML5的FileReader生成Data Url</title>
<meta name="keywords" content="Data Url,HTML5,FileReader"/>
<meta name="description" content="如何用HTML5的FileReader生成Data Url"/>
<script type="text/javascript">
 
function buildDataUrl(source) {
	var file = source.files[0];
	if(window.FileReader) {
		var fr = new FileReader();
		fr.onloadend = function(e) {
			document.getElementById("txtBase64").value = e.target.result;
			document.getElementById("imgView").src = e.target.result;
		};
		fr.readAsDataURL(file);
	}
}
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<p>如何用HTML5的FileReader生成Data Url</p>
<input type="file" value="" onchange="buildDataUrl(this)" style="border:1px solid #808080; width:300px;" /><br />
<textarea id="txtBase64" cols="50" rows="20"></textarea>
<img id="imgView" src="" style="width:300px;" />
<br/><br/>
MarkDown中引用图片标签：
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![][label]<br/>
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MarkDown 图片标签的定义：
<br/>
[label]:……
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